[TowerTalk] Rohn 20/25G leg insulator material

[Roger (K8RI)]

Mark Robinson wrote:
> The consensus was to use solid FR4 G10 rod.
>   
I wonder about that as ground fiberglass is sensitive to degradation by 
moisture and UV.

> These guys sell it and I believe that they can do the machining required.
>
> http://www.jjorly.com/g10_rod_rods.htm
>   
I think I also saw a $250 minimum order.

73

Roger (K8RI)
>
> ----- Original Message ----- 
> From: "Allen R. Brier" <n5xz at earthlink.net>
> To: <towertalk at contesting.com>
> Cc: "'Rick Hiller'" <rhiller at sdicgm.com>
> Sent: Monday, 13 April, 2009 3:39 PM
> Subject: [TowerTalk] Rohn 20/25G leg insulator material
>
>
>   
>> I wish to build an 80 meter vertical using some Rohn 20G sections I have in
>> storage. In the past there was some mention of insulating material that
>> could be used at the base. If possible, I would like to get that 
>> information
>> again from the group. I would like to make the vertical self supporting 
>> i.e.
>> no guys (bosses request). Will the material be strong enough for that?
>>
>> In addition, what would be a good recommendation for the vertical
>> configuration, i.e. how many 20G sections and how much of a stinger on 
>> top?
>> Obviously maximum bandwidth and efficiency is the goal and I operate 
>> mostly
>> CW.
>>
>> Next, I would also like to consider using the same antenna on 160 meters, 
>> by
>> switching in a loading coil at the bottom. I know this isn't optimal, but 
>> I
>> would like some recommendation for how much inductance in would need, or 
>> the
>> coil configuration (full legal limit, of course). Other recommendations
>> would also be appreciated.
>>
>> Finally, I also have a 70 foot crank-up tower with a 4-el SteppIR on top
>> that could be shunt fed. If I did shunt feed the tower, what would be the
>> optimal distance between them for phasing purposes?
>>
>> A lot and questions in one email but I would appreciate any and all 
>> advice.
>>
>> 73,
>>
>> Allen Brier N5XZ / KL5DX
>> 1515 Windloch Lane
>> Richmond, TX 77406-2533
>> 281-342-1882
>> 713-705-4801 (Cell)
>> n5xz at arrl.net
>>
>> _______________________________________________
>>
>>
>>
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